Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 South America [Member]	Mar. 31, 2013 Geofinity Manufacturing of Surrey, British Columbia [Member]	Mar. 31, 2014 Barkell Limited of Consett, United Kingdom [Member]	Mar. 31, 2013 Radiadores Visconde Ltda [Member]	Sep. 30, 2012 Radiadores Visconde Ltda [Member] South America [Member]
Business Acquisition [Line Items]
Purchase price allocation resulted in property, plant and equipment						$ 2.0
Cash consideration, net of cash acquired	7.8	4.9	0		4.9	7.8
Purchase price allocation resulted in acquired intangible assets					3.5	4.7
Purchase price allocation, working capital net assets					0.6	1.1
Purchase price allocation, goodwill		0.8		0	0.8
Intangible assets, amortization period					10 years	10 years
Percentage of interests acquired (in hundredths)						100.00%	50.00%
Notes payable							2.0
Selling, general and administrative expense, decrease								$ 2.0